Abstract
In this study, two new collectors for fluorite flotation DP-OMC-1033 (DP-I) and DP-OMC-1234 (DP-II) were tested and compared with oleic acid (OA), sodium oleate (SO) and potassium oleate (PO). According to fluorite grade and fluorite metallurgical recovery, the effect of each collector was determined, both in mechanical and pneumatic cell flotation. The effect of temperature on the collectors from 25 to 55 °C was studied. Flotation tests showed that the best results in terms of fluorite metallurgical recovery were 82.8% and 87.9% for new collectors DP-I and DP-II respectively, for a dosage of 100 g/t and using pneumatic cell. Additionally, in terms of fluorite grade, DP-I showed the best results, achieving 79.7% of CaF2 in roughing step for a dosage of 100 g/t. Fluorite metallurgical recovery and grade in concentrate increased for OA, SO and PO with increasing temperature. However temperature did not have a significant effect on both metallurgy recovery and CaF2 grade using DP-I and DP-II, so the process can be effective at 25 °C reducing operating costs.
Highlights
The mineral from which fluorine-based chemicals are obtained is fluorite (CaF2 )
CaF2 contained in the feed stream that is recovered in the concentrate) in the mechanical cell (a) and Figure 4 presents effects of collector dosage on fluorite metallurgical recovery (total mass of pneumatic cell (b) flotation with various collectors at 25 °C
CaF2 contained in the feed stream that is recovered in the concentrate) in the mechanical cell (a) metallurgical recovery of concentrates gradually decreased from 79.8% to 73.9%, with the increase of and pneumatic cell (b) flotation with various collectors at 25 ◦ C
Summary
The mineral from which fluorine-based chemicals are obtained is fluorite (CaF2 ). Due to its economic importance and high demand, CaF2 has been classified as a strategic mineral source by the European Union [3]. Other countries such as China, Mexico and the United States rise CaF2 to the category of strategic resource for their economies [4,5]. CaF2 makes it necessary to optimize the treatment process and reduce the grade of fluorite in the waste dumps [3]. To obtain acid grade fluorite it is necessary to use physic-chemical beneficiation methods such as froth flotation [7,8]
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